warnx
Name
warnx -- formatted error messages
Synopsis
void
warnx
(const char *
fmt, ...);
Description
The warnx() function shall display a formatted error message on the
standard error stream. The last component of the program name, a colon
character, and a space shall be output. If fmt is
non-NULL, it shall be used as the format string
for the printf() family of functions, and
the formatted error message, a colon
character, and a space shall be output. The output shall be followed by a
newline character.